This action horror game brings new meaning to the phrase "retail hell." Dead Rising uses a dynamic real-time system in which time continues to pass whether Frank is actively engaged or remains stationary. For example, though they move slowly during the day, zombies become stronger and faster when the sun sets and make it even more difficult to survive at night. The unprecedented swarms come in never-ending waves and consist of a diverse population. These former humans retain some memory of their previous lives and it is reflected in their behavior and appearance. The variety of different stores in the mall offers an endless supply of resources including vehicles, makeshift weapons and more. Other survivors are encountered along the way and helping them can provide valuable clues as to what has happened.